Improvement in thrashing-machines



diluted. swag Josnr'n A LLoNAs; or MANS IEL OHIO.

Letters Patent No. 107,994, dated October 4, 1870.

IMPROVEMENT IN THRASHlN-G-MACHINES.

, v The Schedule referred to in these Letters latent and making part of the ame To, all whom it may concern machine.

The invention relates to that class of thrashers and separators in which the straw and grain after passing the thrashing-cylinder are thrown into a long perforated or reticulated revolving screen or bolt, by means of which the grain is separated from the straw, the grain passing through the screen and being conveyed to a winuowing apparatus, while the straw is delivered from the rear or open end ofsaid screen.

The invention consists, first, in combiningwith said screen and spiral rib a series of fingers or spurs attached to the inner side of the screen, and inclining inward and rearward, to assist in agitating the straw; second, in

combining with the screen a series of fingers or rods arranged at its discharging end, and forming an extension thereof, said extension being much more open in its construction,and adapted to allow the tailings or unthrashed heads to pass through into the tail-spout; third, in the arrangement-of the friction-rollers, which support the screen against the end-thrust consequent upon its inclined position at a the front end of the screen, whereby they can be made to bear against the cogged rim through which the screen is made to revolve, and in certain other features ofconstruction which will be fully explained.

Iii-the drawing- 1 A A are sills, which, together with posts A and girts A A, form the frame-work upon which are supported the working parts of the machine as follows B is the thrashing-cylinder, and

B the concaver'Both of these parts maybe of any usual or desired construction, and need not be described in detail.

,b is an apron, in practice extending to the front of the machine, and over which the grain is fed to the thrashing-cylinder. V

O is a perforated or reticulated screen or bolt, made of wood or other suitable material, and placed directly in rear of cylinder B, in such position that the grain and straw can be discharged from said cylinder di- 'rcctly into it, as shown in the drawing.

This screen has no shaft or axle to support it, ,but

rests upon a series of friction-rollers, c. 0, attached to the frame-work of the machine, substantially in the posit-i011 shown, so that the screen shall descend slightly, the rear or discharging-end being the lowest.

C is a cogged rim, fitting closely to the front orreceiving-eudot' the screen, and provided with a shoulder or flange projecting beyond the cogs, as isplainl y shown at 0 fig. 2, this shoulder resting upon and traversing one pair of the friction-wheels.

At the other end of the screen there 'is'a similar rim, 0*, except that it has a smooth flange, 0 instead 1, This rim rests upon its correspond. ing pair of friotiomrollcrs, thus supporting the rear:

of being cogged.

end of the screen.

At the front end of the screen I place another pair} of fi-iction-rollers, c 0, directly in rear of cogged rim j 0 and so located that said rim shall rest against them, whereby they are made to resist the end-thrust of the screen, consequent upon its inclined position.

I) D are fingers, projecting beyond the rear end of screen G,'and forming] a sort of open-work extension, for apurposewhich will be hereinafter explained.

E E are fingers or spurs, firmly attached to the inside of the screen. 'lhey project inward toward the center, and also incline toward the rear end of the screen.

The number and location of these spurs may be varied to suit the kind and condition of the grain to be thrashed.

E'is a spiral or screw-rib, running from end to end upon the inside of screen O. This rib may be made of "either wood or metal, and should be of such height a'stvill allow the straw to pass readily over it without sweeping the grain with it. I usually prefer to employ two or more of these ribs placed parallel with each other, as by so doing I can increase the pitch of the screw, and yet keep theribs close enough togethers k The screen is provided with hoops or bands, which, in combination with the spiral rib, give to it (the screen) great stifihess and strength, while at the same time it can be made veryligh-t; in fact, it maybe made wholly of narrow strips or slat-s. I

For the purpose of protecting the screen and its ascompanying partsfrom the sun and rain, a shell, semi-cylindrical in form, is supported above the screen in any desired manner. I 1

F is a carrying or grain-table, placed below the screen and mounted upon vibrating links, as is customary in this class of machines.' This table has a reciprocating motion imparted to it by means of eccentric f on shaft F, eccentric f being connected with table F by pitman f I Shaft F is mounted on bearings on the frame-work of the machine, and driven by a belt from the shaft of the tln'ashing-oylinder B. 

